A jack used properly is a safe and effective way to direct the direction of a fell tree. I used a 50 ton bottle jack on a Douglas fir that was 150 feet tall next to the cabin. Cut a pocket 180 degrees from the directing notch. It works to replace the normally used wedges with the control of a jack. Maybe just luck , but the tree went right where it was supposed to. A straight growing tree is a lot easier to fell than something like an oak tree. Had to hire an out fit with a crane to remove a 6 foot diameter oak tree next to the house